Abstract: Provided is a production method with which it is possible to produce beta zeolite at high purity by suppressing the generation of impurities by a seed crystal addition method that can reduce the environmental burden as much as possible, without using an organic structure-directing agent. This method for producing beta zeolite having a step that mixes and heats an organic-compound-free reaction mixture comprising a silica source, alumina source, alkali source, and water with beta zeolite seed crystals, wherein (I) beta zeolite synthesized without using an organic structure-directing agent and having 90% or more by volume of particles 10 ?m or less in diameter in the particle size distribution by a laser diffraction scattering-type particle size distribution measurement method is used, (III) acid-treated zeolite in which the SiO2/Al2O3 ratio is 150 or less is prepared by (II) contact treatment with an acidic aqueous solution, and the acid-treated zeolite is used as the beta zeolite seed crystals.